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Ruddy shelducks and black-headed gulls are seen on a lake in Longwangtan Park in Lhasa, capital city of southwest China's Tibet Autonomous Region, March 13, 2019. (Xinhua/Zhang Rufeng)
Ruddy shelducks and black-headed gulls are seen on a lake in Longwangtan Park in Lhasa, capital city of southwest China's Tibet Autonomous Region, March 13, 2019. (Xinhua/Zhang Rufeng)